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author | Petr Mrázek <peterix@gmail.com> | 2016-04-10 15:53:05 +0200 |
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committer | Petr Mrázek <peterix@gmail.com> | 2016-05-01 00:00:14 +0200 |
commit | b6d455a02bd338e9dc0faa09d4d8177ecd8d569a (patch) | |
tree | 41982bca1ede50049f2f8c7109dd18edeefde6d0 /libraries/xz-embedded/src/xz_stream.h | |
parent | 47e37635f50c09b4f9a9ee7699e3120bab3e4088 (diff) | |
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NOISSUE reorganize and document libraries
Diffstat (limited to 'libraries/xz-embedded/src/xz_stream.h')
-rw-r--r-- | libraries/xz-embedded/src/xz_stream.h | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/libraries/xz-embedded/src/xz_stream.h b/libraries/xz-embedded/src/xz_stream.h new file mode 100644 index 00000000..c0e191e6 --- /dev/null +++ b/libraries/xz-embedded/src/xz_stream.h @@ -0,0 +1,62 @@ +/* + * Definitions for handling the .xz file format + * + * Author: Lasse Collin <lasse.collin@tukaani.org> + * + * This file has been put into the public domain. + * You can do whatever you want with this file. + */ + +#ifndef XZ_STREAM_H +#define XZ_STREAM_H + +#if defined(__KERNEL__) && !XZ_INTERNAL_CRC32 +#include <linux/crc32.h> +#undef crc32 +#define xz_crc32(buf, size, crc) (~crc32_le(~(uint32_t)(crc), buf, size)) +#endif + +/* + * See the .xz file format specification at + * http://tukaani.org/xz/xz-file-format.txt + * to understand the container format. + */ + +#define STREAM_HEADER_SIZE 12 + +#define HEADER_MAGIC "\3757zXZ" +#define HEADER_MAGIC_SIZE 6 + +#define FOOTER_MAGIC "YZ" +#define FOOTER_MAGIC_SIZE 2 + +/* + * Variable-length integer can hold a 63-bit unsigned integer or a special + * value indicating that the value is unknown. + * + * Experimental: vli_type can be defined to uint32_t to save a few bytes + * in code size (no effect on speed). Doing so limits the uncompressed and + * compressed size of the file to less than 256 MiB and may also weaken + * error detection slightly. + */ +typedef uint64_t vli_type; + +#define VLI_MAX ((vli_type) - 1 / 2) +#define VLI_UNKNOWN ((vli_type) - 1) + +/* Maximum encoded size of a VLI */ +#define VLI_BYTES_MAX (sizeof(vli_type) * 8 / 7) + +/* Integrity Check types */ +enum xz_check +{ + XZ_CHECK_NONE = 0, + XZ_CHECK_CRC32 = 1, + XZ_CHECK_CRC64 = 4, + XZ_CHECK_SHA256 = 10 +}; + +/* Maximum possible Check ID */ +#define XZ_CHECK_MAX 15 + +#endif |